Atlantic Deep-Sea Scallop or Smooth Scallop, also known simply as the Scallop shell
Phylum: Mollusca, Class: Bivalvia, Order: Pectinida, Family: Pectinidae, Genus: Argopecten, Species: Argopecten gibbus · Pectinidae (Scallop family) · Bivalve (two-shelled), whole individual valve with fan shape
Species
Argopecten gibbus
Shell Type
Bivalve (two-shelled), whole individual valve with fan shape
Family
Pectinidae (Scallop family)
Size
Approximately 1.5 to 2 inches in diameter, which is a standard adult size for this species. Adults typically range from 1 to 2.5 inches.
Color & Pattern
Attractive coloration featuring a whitish or pale lavender base with prominent, deep purple-red or burgundy radial rays running down the prominent ribs. The colors are entirely natural and well-preserved with distinct contrast.
Rarity
Common
Habitat
Found in shallow subtidal waters to moderate depths, typically inhabiting sandy or shelly substrates, seagrass beds, and offshore shelf areas.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina down through Florida, the Gulf of Mexico, and the Caribbean Sea.
Description
A classic fan-shaped bivalve with roughly 18 to 20 rounded radial ribs radiating from the umbo. The margins are finely scalloped, and the surface displays smooth yet defined ridges with striking purple striping against a pale background.
Key Features
Symmetrical fan shape, prominent rounded radial ribs, distinct contrasting dark purple-red stripes on a lighter background, and slightly unequal auricles (ears) at the hinge.
Collector Value
Low to Moderate. Very popular with beginner and intermediate beachcombers and shell crafters, though high-color or gem-grade specimens command a small premium.
Condition Notes
Good to Fine condition. The valve is intact with minimal edge wear, natural vibrant colors preserved with only slight sun-fading, and no major structural fractures.
Interesting Facts
Scallops are unique among bivalves because they are capable of swimming by rapidly clapping their valves together to expel water, and they possess dozens of simple blue eyes along their mantle edges.
Ecological Role
Scallops are active filter feeders helping to clear the water column. They serve as an important food source for various marine predators including sea stars, octopuses, fish, and gulls.
Similar Species
Bay Scallop (Argopecten irradians), which tends to be slightly rounder with deeper ribs and is found in shallower inshore grass flats.
Beach Finding Tips
Look along ocean-facing sandy beaches after storms or heavy high tides, particularly near offshore shell banks or grass flats.